Attachment for telephones.



A. G. HOWARD. ATTACHMENT FOR TELEPHONES. APPLICATION FILED MAB. a. 1909.

956,530. Patented Ma a, 1910.

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ATTACHMENT FOR TBLEPHONES.

APPLICATION FILED MAR. a, 1909.

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A. G. HOWARD. ATTACHMENT FOR TELBPHONBS. LPPLIUATIOH FILED BAR. 9, 1909.

956,530. Patented May a, 1910.

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ATTACHMENT FOR TELEPHGNEB.

APPLIUATION TILED MAB. 9, 1909. 5 ,55 Patented May 3, 1910.

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APPLICATION FILED MAE. 9.1909.

Patented May 3, 1910.

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A. G. HOWARD. ATT AUHMENT FOR TELEPHONES. APPLICATION 11.31) In. a.'1909.

Patented May 3, 1910.

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ABEN GUSTAF HOWARD, OF HOLDREGE, NEBRASKA.

ATTACHMENT FOR TELEPHONES.

Specification of Letters Patent.

Patented. May 3, 1910.

Application filed March 9, 1909. Serial No. 482,307.

To all whom it may concern:

lie it known that I, Anon G. HoWARn, a citizen of the United States,residing at l-loldrcgc, in the county of Phelps and State of Nebraska,have invented a new and useful Improvement in Attacl'nnents forTelephones, of which the following is a specitication.

This invention is an attachment for telephones, and may be built into atelephone casing, or it may be applied to telephones already in use.

The object of the invention is to allow two or more parties tocommunicate with each other without permitting other parties to listenwithout the knowledge of the first mentioned parties.

A further object of the invention is to provide a time indicating dialso that a. party using the line can see exactly how long they use theline without interruption, that is without. breaking the circuit, such,time indicating means being especially valuable where there is a timelimit, or where payment is charged according to the time during whichthe telephone is in use.

Many telephone companies have rules covering both of these points,forbidding any person to' take down his receiver for the purpose oflistening to conversation between other parties, and also limiting theuse of the line for a limited time only, usually from three to fiveminutes. The first rule has been practically impossible of enforcementowing to the difiiculty of detecting the party breaking into thecircuit, and the second is the cause of many disputes as to the actualtime parties had consumed.

lVith these objects in view, my invention consists of an attachment fortelephones having connected thereto a code signal peculiar to eachtelephone upon a party line, said signal consisting of tuning forks orkey notes of a different pitch together with means for vibrating saidforks or keys in a certain manner upon the completing of an electriccircuit thereby sending over the line certain musical toneseasilyre-cognized, and which indicate the telephone from which saidtones were sent.

The invention also includes an index hand traveling over a dial, whichhand indicates, by the extent of its travel, the length of time the linehas been used at any given time.

The invention also consists in the novel features of construction bymeans of which said signals and time indicating devices are set inoperation, controlled, and otherwise adapted to attain the objects aboveset forth.

In the accompanying drawings: Figure 1 is a side elevation of the lefthand side of a telephone with my attachment -in place. Fig. 2 is a.front elevation of the attachment the casing being removed. Fig. 3 is anend elevation the casing being removed. Fig. 4L is a top plan view thecasing being removed. Fig. 5 is a rear view of the parts shown in Fig.3. Fig. 6 is a section on the line 66 of Fig. 2. Fig. 7 is a section onthe line 77 of Fig. 5. Fig. 8 is a detail perspective view of a mainshaft. Fig. 9 is a perspective view of a winding drum. Figs. 10, 11, 12,13, 14, 15 and 16 are detail views of parts carried by the shaft shownin Fig. 8 and the winding drum of Fig. 9, and shown detached. Fig. 17 isa detail view of an index hand and shaft. Fig. 18 is a detailperspective view showing an end portion of the shaft shown in Fig. 8.Figs. 19, 20 and 21 are perspective views of parts carried by the end ofthe shaftshown in Fig. 18. Fig. 22 is a perspective view of an angledlever. Fig. 23 is a perspective View of a circuit making and breakingdevice. Fig. 24 is a side elevation, partly in section of a govcnnoradapted to cooperate with the circuit making and breaking device shownin Fig. 23.

In constructing this attachment, I employ two metal plates 1 and 2,spaced apart, the plate 1 being larger and extending lower down than theplate 2. These plates are connected by suitable bolt-s to form a rigidframe and in the plates I journal a. shaft 3,

the opposite ends of which are reduced and threaded as shown at 4. Thisshaft has fixed upon it a gear wheel 5, which forms a gear of av trainto be hereafter referred to.

'A disk 6 is also fixed upon the shaft 3, said disk carrying a dog 7.Over an end portion of the shaft 3 fits a sleeve 8 which at one endcarries a ratchet wheel 9, the sleeve and ratchet wheel fitting againstthe disk 6, and. the dog 7 engaging the said ratchet wheel,

thus locking the sleeve 8 and the shaft 3 together when the sleev.e -,.8is rotated in one direction. type is placed upon the sleeve 8, the lnnerend of the spring being secured to a pin 11 carried by the sleeve 8, andthe outer end of the spring being secured to a suitable post or pincarried by the plate 2. The outer end A springlti of the flat coiled' ofthe sleeve 8 is provided with two oppositely arranged longitudinallyextending ln s 12. Over the sleeve fits loosely a circu ar plate 13provided with upper and lower angled cars 14 and which when the partsare assembled is adjacent the ratchet wheel 9, the said ratchet workingbetween the disk 6, to which it is connected by the dog 7, and the plate13, the disk 6 being connected to the shaft 3 and the plate 13 beingconnected to the frame plate 2, as shown in Fig. 2. A winding lever 15is mounted loosely upon the sleeve 8, and carries a lateral projection1-6 which engages a projecting ear 17 formed upon a disk 18 which isprovided with a rectangular slot 19 which slot fits over the projectinglugs 12 of the sleeve 8. A suitable washer 20 similarly slotted is alsofitted over these lugs against the disk 18, and a washer 21 is fittedover the reduced threaded portion 4 at this end of the shaft, whichthreaded portion projects between and beyond the lugs 12. A suitable nutis then threaded on to this projection thus locking the washers, thewinding disk 18 and the winding lever 15 in place. It will be obviousthat as the lever 15 is moved downwardly the projection 16 will bearupon the ear 17 of the winding disk, thus giving a partial rotation tosaid disk, and to the sleeve 8, thus winding the spring. The windinglever being loose upon the sleeve is then drawn back to its normalposition by means of a spring 22, and as the winding disk 18 remainsturned in the position into which it was forced by the downward movementof the winding lever, additional movement of said lever will not affectthe spring, until after the spring is unwound to a certain extent andthe ears 17 brought either into or toward its normal position. It istherefore impossible to wind the spring beyond certain limits. Thewinding lever works between suitable guide bars 23 secured at theirupper ends to the plate 2 and at their lower ends to the plate 1.

It will be understood that the parts above described, that is thesleeve, the winding lever and adjacent parts are all upon one endportion of the shaft 3. The opposite end of the shaft, shown in detailin Fig. 18 has a reduced squared portion 24 in addition to the threadedportion 4 and over this portion 24 fits a disk 25 having a squaredsocket 26. Fitting over a smooth portion of the reduced portion 4 is afriction disk 27 carrying oppositely extending arms 28, and held infrictional'contact with the disk 25 by means of a concavo convex springwasher 29 which is held upon the reduced portion 4 by means of asuitable n'ut. This washer pressing the disk 27 against the disk 25 willcause both of them to rotate together, and then will also rotate withthe shaft 3, which shaft is rotated by the winding of the spring throughthe medium of the ratchet wheel and 0g previously described.

To control the operation of the device, I provide a governor driven bmeans of a gear train 30, the gear whee 5 being the first gear wheel ofsaid train, and a beveled gear wheel 31 completing the gear train andmeshing with a beveled gear 32 fixed upon the lower end of a shaft 33.The gov ernor is mounted upon the plate 1 by means of a bracket 34. Thisgovernor which is shown in detail in Fig. 24 consists of the shaft 33and fixed angled arms 35 which extend upon opposite sides of the shaft,and pivotally connected to the depending end portions of the arms 35 areangled arms 36 which at their lower ends carry balls 37. Slidable uponthe shaft 33 is a sleeve 38 connected to the upper inner ends of thearms 36 by means of links 39 and the said sleeve carries two paralleldisks 40 slightly spaced apart and which slide upon the shaft 33 withthe sleeve. It will be obvious that the rotation of the arms 36 with theshaft 33 will cause the balls 37 to move outwardly and upwardly, thuslowering their inner ends and causing the sleeve 38 to move downwardlyupon the shaft 33.

Secured to the frame plate 2is a bracket frame 41 in the open end ofwhich is pivotally mounted a shaft 42. Said shaft carries two divergingarms 43 and 44 respectively. The arm 43 is provided with a tip 45 whichrests between the disks 40 of the governor, so that sliding movement ofthe said disks up and down the shaft 33 will lift and lower the arm 43and rock the shaft 42. The arm 44 carries at its free end a wedgeshapedcontact plate 46 which as the arm 44 is lowered passes between twovertically arranged metallic strips 47, the upper ends of which arecurved outwardly to receive the contact plate 46. These strips aresecured together but are spaced apart by a block of insulating material48. The receiver circuit of the usual telephone is cut and the saidstrips 47 are provided with perforated cars at their lower ends and areinserted in the cut circuit, the conductor wire 49, 49 being joined tosaid ears. It will be obvious therefore that as long as the arm 44 islifted the receiver circuit will be broken, but as soon as the governorhas obtained a certain speed, the arm 44 will be lowered and the circuitbetween the wires 49 and 49 will be completed through the strips 47 andthrough the wedge 46.

A time dial 50 is carried by the plate 2,

which is the front plate of the attachment and this dial is providedwith a shaft 51 shown in detail in Fig. 17 the front end of whichcarries an index hand 52 and the'rear end is angled as shown at 53 andis connected by a link 54 to one of the arms 28 of the friction disk27Y';AI1 arched lever 55 is connected at one end to the outer endportion of the winding lever 15 and the other end fits loosely over thereduced end portion 4- of the shaft 3 being held l'ietween suitable locknuts and the convex face of the washer 29. This lever has a pin 28 andconnects the winding lever indirectly to the shaft 8, so that thedownward movement. of said winding lever will rotate the said shaft, butit will be remembered that the lever 55 is loose upon said shaft, andupon upward movement of the winding lever there will be no reversemovement of the shaft.

In order to provide a signal code, I provide a carrying frame and themechanism to be hereafter described. A plate 56 is pivoted to the plate1, so as to have a slight vertical swinging movement, the free 'end ofsaid plate working in a bracket. 57, and the plate 56 carries midway itsends a pin 58 upon which is mounted a vertically arranged bar 59, theupper end of which is slotted as shown at 60. Mounted also upon the pin58 are two disks 61 and 62, the central portions of said disks beingsecured rigidly together, but their longitudinal portions being spacedslightly apart, and the lower marginal portions of these disks arenotched in a peculiar manner for the purpose of giv-' ing the desiredsignal, which notches will be described at length hereafter. Both bar 59and the code signal disks are secured together by' means of a suitablepin 68 which pin is carried by the bar 59 and engages one of a. seriesof perforations 64 formed in the disks 61 and 62. The disks and bar 59having been placed in position upon the pin 58 are locked thereon by ahinged bar 65, which bar is hinged at one end to the pivoted end.portion of the bar 56, and the free end of said bar 56 is curvedoutwardly to form a spring catch for retaining andholding in a closedposition the free end of the locking bar 65. This mounts the code disks61 and 62 and their operating bar 59 in a frame composed of two parallelbars 56 and 65,- the first of which is pivoted to swing vertically andthe second 'of which is hinged to the first. A spring 66 is secured atone end to the plate 1 and its free curved end passes up wardly againstthe lower edge of the pivoted bar 56. Swinging movement of the bar 56 isobtained by means of a pivoted lever 67, said lever being pivoted at oneend to a bracket 68 carried by the plate 1, and having its opposite endslotted as shown at 69, the slotted end of the lever 67 restingtransversely across the upper slotted end ortion of the bar 59. linkedrod 70 pivotally connects the lever 67 to the pivoted bar 56.

In order to rock the bar 59 and the lever 67 and thus impart a rockingmotion to the disks 61 and 62, I provide a'gear wheel-71 which meshesWitha gear of the train 30, and which carries a disk 72 provided with aWrist pin 73 which pin passes through the slots 60 and (39 of the bar 59and lever 67. It will therefore be obvious that during rotation of thegears, the rotation of the disk 72 wi l rock the bar 59, thus impartinga rockii'ig l'I'lOVtH'lt-Ill of the disks 61. and 62, to which the baris connected by a pin at a point above the center of said disks, and thedisks will also be given at the same time a vertical movel'nent by therocking of the lever 67 and consequent swinging of the frame whichcarries said disks.

Cooperating with the signal disks 6], and (32- are two tongues 74 and 75which are se cured at one end to a suitable bracket 76 carried by theplate 1, and the free ends of these tongues, which in their use resembletuning forks, are acted upon by teeth 78 and 79 formed respectively uponthe disks 61 and 62. The tongues 74 and 75 are given a different pitch,one tongue having a low and the other a comparatively high pitch, thediiference between the two being sufiiciently great to be readilydistinguished over the telephone wires. As the disks are rocked, theteeth 78 and 79 will vibrate these tongues. The teeth of one disk areoffset with respect to those of the other and the number of the teethand their arrangement differs upon each set of disks, so that no twoattachments upon one party line have the same set of signals. The mannerin which these signals are employed will appear more fully in thedescription of the operation of the device,

In order to lock the signal devices, when the telephone is not in useand to release them when the telephone is used, the following trippingmechanism is employed: A trip lever 80 is pivoted upon a stud bolt 81connectin plates 1 and 2, and this trip lever is ang ed at its free endand supports the weight of the receiver 82 and the receiver hook 83.When so weighted down, the trip lever 80 will rest upon a bracket 8%attached. to the front face of the plate 1, the said trip lever workingbetween plates 1 and 2. But when the receiver is removed from thereceiver hook, and the receiver hook lifts, as in the ordinarytelephone, the trip lever Wlll be moved upwardly, following the receiverhook and keeping in contact with it, through the action of a coil spring85 connected at one end to the plate 1 and at the opposite end to thelever. Depending from the plate 56' is an arm 86 to which is pivotallyconnected a locking lever 87, the hook end 88 of which is pressed by aspring 89 into normal engagement with the lower notched end of the bar59, and the outer end of the locking lever 87 is operatively connectedto a vertically movable rod 90 the upper end of the rod being pivoted toa link 91 pivoted in turn to an upper corner portion of plate 1, the rodworking midway its ends through a guide bracket 92. This rod is providedwith a lug 93 which engages the trip lever 80. As the trip lever riseswith the rise of the receiver hook, the rod 90 is lifted, and the hookend 88 of the lever 87 is depressed and disengages from the lower end ofthe bar 59. It Wlll be obvious that as long as the said locking lever isin engagement with the bar 59 the bar will be held against rockingmovement upon its pivotal point, thus h0lding the wrist pin 73stationary, locking the lever 67 the gear train and the spring 10.

In order to regulate the speed of the governor, and consequently theother mechanism, I secure a block 94; to the plate 1 which carries aspring 95, and a suitable tension screw 96 bears upon the under side ofthis spring. The spring 95 bears upon the lower disk 10 of the governorand by adjustlng the screw the pressure of the spring upon the saiddisk, and consequently the speed of the governor, when the sleeve 38 isforced downward by the balls against the said spring, is regulated.

The parts above described complete the attachment, and it can be appliedto any form of telephone, the method of application depending to a greatextent upon the form of the telephone to which it is to be applied. Inorder to attach it, it will be necessary, no matter what the make of thetelephone, to arrange the attachment so that the receiver hook of thetelephone will bear upon the trip lever and normally hold itagainst thebracket 84. It is also necessary to cut the receiver circuit and attachthe cut ends to the metal strips 47, as shown at 49 and 49 Furthermore,as my attachment is connected to the front of the telephone, it will inmost cases be necessary to add a longer transmitter arm as shown at 97,and .the transmitter circuitis extended through this arm, but theoriginal transmitter may of course be employed. With the exception ofthe cutting of the receiver circuit and the possible extending of thetransmitter'circuit to reach through the longer arm, no changes are madein the original telephone parts, and none of these parts are claimed asa part of this invention. w

The operation of my attachment is as follows: The winding lever 15 isgrasped by the handle and moved into its downward position. Thismovement causes the pin 16 to bear upon the projection. 17 of theslotted plate 18, thus rotating the sleeve 8 and winding the spring 10.Thespring cannot unwind, by reason of the engagement of the dog 7 withthe ratchet 9, without rotating the shaft 3. and in order to permit theshaft torotate, it is necessary to disengage the locking lever 87 fromthe bar 59. The winding of the spring therefore does not set the devicein operation and after being forced down, the spring 22 draws thewinding lever back to its normal osition, leaving the spring 10 wound. Xsecond downward movement of the winding lever at this time would have noefiect upon the spring. The winding lever also through the arched lever55 will set the index hand 52. The parts are now in osition for use andas soon as the receiver is taken from the receiver hook, the hook willrise in the usual manner, thus permitting the rise of the tripping lever86 which will lift the rod 90, thus operating the locking lever 87 andreleasing the mechanism. The shaft 3 will now be driven by the spring10, and through the train of gears the governor will be operated, andthe disk 72, the wrist pin 73 of which rocks the'bar 59 and the lever67. The rocking of this bar and lever imparts the necessary motion tothe disks 61 and 62 and the teeth upon said disks will engage thetongues 74: and 75, causing two or more musical notes to be sounded insuccession, depending upon the arrangement of the said disks in theirframes. It will be noted that these disks are provided with teetharranged in groups, and as shown in the drawing the disk 62 has onetooth 78, then a space, and then a group of three teeth. The disk 61 hasa group of two teeth which register with the space formed between thefirst and second groups of disk 62, then a space which extends beyondthe second group, of disk 62, and the disk 61 is then provided with asingle tooth. Assuming that the disk 61 engages a tongue having a lowpitch and the disk 62 engages the tongue having the'higber pitch, itwill be obvious that if the dial is set so that the first teeth of disk62 and the first group of two teeth of disk 61 engage the tongues, asignal consisting of one high and two low tones will be given. It willalso be obvious thatby turning the disks and fitting the pin 63 intoanother of the holes 6 1, the diskscould be adjusted so that they wouldcause the tongues to give forth a different signal, and it will beunderstood that the disks may be provided with any number of suchgroups, which groups may be arranged in various order, and in eachtelephone upon a party line, the disks are locked in their frames sothat no two will give forth the same signal. In order to furthersimplify the signals, it is intended that the tones given out are tocorrespond with the call.-

For example if the call of one party is one short ring, the disks in histelephone will be locked in position so that the signal will be one highnote. If the call is one long and one short ring, the disks will bearranged to give one low and one high tone. In the examplefirst, givenwhere the signal was one high and two low tones, the call would be oneshort'and two long-rings. It will be understood that the tones given outby these tongues are picked up by the transmitter and go out over theline, and throuh the action of the wrist pin, this signal ca 1. will besent over the line at brief intervals during the entire time that thereceiver is down ant the mechanism running. This signal is heard by theparty called up and would be also heard by any other parties who mightcut intxi the circuit. It will now be obvious that if A and B wereengaged in conversation and C whose call was one short and one long ringwas to press down upon his winding lever and then take down hisreceiver, A and B would at once hear one high and one low tone, and theywould know at once that C had placed his telephone into the circuitbyremoving the receiver from its hook, and this tell-tale signal would betransmitted to A and B as long as C kept his receiver from the hook. Itis therefore obvious that before 0 could have an opportunity to hear anyof the conversation between A and B, both of the latter would havereceived. notice of Us act, and as his signal was the same as his call,they would have no difiiculty in identifying the party who was listeningor endeavoring to cut into the circuit. They could therefore request himto replace his receiver, and they could determine by the cessation ofthe signal when he had done so.

It will be understood that when the winding lever is pushed down, and atall times while the mechanism is not running, the receiver circuit isbroken. After the receiver is lifted from the hook and the trip leverhas released the mechanism, the operation of the governor will, throughthe arms 43 and 44 and the wedge-shaped contact plate #16, complete thecircuit, and it may be further explained that the arm 44 is notconnected directly to the plate 46, but carries a block of fiber orother insulating material 4% to which the contact plate 46 is secured.The telephone cannot be used therefore for the purpose of hearing overthe line until the attachment has been set in operation and the governorhas reached a speed great enough to complete the circuit. As soon as thereceiver is placed back upon the hook, the device will be relocked, andthe stopping of the governor will break the circuit. During the time theattachment is running the in eX hand 52 will be traveling over the dialand when the device stops the position of the hand will indicate thenumber of minutes the telephone has been in use. The device is designedto run for a period of about ten minutes, without rewinding, althoughthis time limit can be extended or shortened, by using a smaller orlarger spring, or by any other desired means.

The musical tones sent out as signals during the time the device isrunnlng while clearly audible, will not interfere with the,

conversation, as would a hell, or other loud or harsh sound. Theadjustment of the signal disks can be made by an employee of thetelephone company and if it is desired to prevent the user of the teleihone from tampering with said. 21(l 'lUSl;lTl(-1Hl-, any means may beemployed for locking the hinged plate 65 in place, thus preventing anychange in the signal sent out.

Bymeans of an attachment constructed and operated as above describedanyone using the telephone can readily determine the length of time theyhave used the telephone, and they can also detect and identify anyperson who may attempt to listen to conversation between themselves andanother party. i

What I claim is:

1. In an attachment for telephones, toothed disks, spring tongues eachhaving a particular pitch in position to be engaged, respectively, bysaid tongues, and means for imparting a compound movement to said disks.

2. In a telephone attachment, a toothed disk, a spring, a sound emittingtongue, and means actuated by said spring for giving said disk a partialrotation and a vertical movement, as and for the purpose set forth.

3. In an attachment for telephones, a frame swinging in a verticalplane, toothed disks rotatably mounted in said frame, sound emittingtongues having a different pitch engaged respectively by said tonguesupon movement of the frame and rotation of the disks, and means forrotating said disks and simultaneously swinging said frames.

4:. In an attachment for telephones, sound emitting tongues, a spring, awinding lever for said spring, means operated by the unwinding of saidspring for engaging and sounding said tongues, locking means, and atripping mechanism for releasing the 1o cking means, said trippingmechanism being automatically operated upon the removal of the telephonereceiver from the receiver hook.

5. In a telephone attachment, a signal mechanism, means for operatingsaid s1gnal mechanism during the time a receiver 1s removed from thehook, locking means cooperating with the signal mechanism, and atripping means for said locking means, the tripping means cooperatingwith and being held in inoperative position by the receiver hook,

6. An attachment of the kind described comprising a winding lever, acircuit making and breaking device interposed 1n a receiver circuit, agovernor operating said c1rcuit making and breakin device, a springWound by movement of said winding lever, a signal device, said signal.device being operated by the unwinding of the spring, a gear traindriven by said spring operating the governor, means for looking all ofthe above mentioned mechanism with the exception of the winding lever,and a trippin lever for releasing said mechanism, sai tripping leverbeing held in an inoperative position by the Weight of the receiver,when upon the receiver hook.

7. In an attachment of the kind described, sound emitting tongues,adjustable toothed disks for engaging said tongues, spring operatedmeans for rotating and locking said disks, means for Winding the spring,means for locking said s ring against unwinding, and a tripping ever forreleasin said spring, said tripping lever being hel inoperative by thereceiver hook of the telephone When the receiver is in place.

8. The combination with a telephone having a receiver hook, a receiver,and a broken receiver circuit, a spring driven governor, a rock shaft,arms carried by said shaft, a contact plate carried by one of said arms,and adapted to complete the receiver circuit, the other arm being inengagement with and operated by the governor for the purpose of lockingthe shaft and making and breaking the receiver circuit, a timeindicating device driven by said spring, and means for Winding saidspring.

9. In an attachment of the kind described, a spring driven gear train,means for Winding thespring, a governor driven from said gear train,means operated by the governor for completing a receiver circuit, and atime indicating hand also driven by said spring,

the said hand indicating the length of time the receiver circuit .iscompleted.

10. A device of the kind described comprising two parallel plates ashaft mounted in said plates, a diskfixed on said-shaft a dog carried bysaid disk, a sleeve fitting loosely on the shaft, a ratchet on saidsleeve in engagement with the dog, a coil spring secured at one end tothe sleeve and at the other end to one of the plates, means for rotatingsaid sleeve and winding the sprin a frame swinging in a vertical plane,toot ed disks rotatably mounted in said frame, sound emitting tongues inposition to be engaged by one or more teeth of said disks, the disksbeing adjustable in their bearings, a slotted bar rigidly secured tosaid disks, a slotted lever a disk having a Wrist pin engaging the slotsof the bar and the lever, said disk being driven from the gear train, alink pivotally connecting the slotted lever to the swinging frame, alocking lever engaging the slotted bar, and a spring operated trippingmechanism for releasing said locking lever, said tripping mechanismbeing held inoperative by Weight of the receiver upon the receiver hook,the receiver hook bearing upon an end portion of the tripping devicewhen the receiver is in place, as and for the purpose set forth.

11. A device of the kind described comprising a spring driven shaft, awinding lever, a shaft parallel to the first mentioned shaft, a dialplate through which said last mentioned shaft passes, an index handcarried by the second mentioned shaft, a disk rotating with the firstmentioned shaft, a link connecting an angled end portion of the secondmentioned shaft to said disk, and an arched lever secured at one endupon the first mentioned shaft, and having its opposite end secured tothe winding lever, movement of said winding lever in one directionwinding the spring and setting said index hand.

ABEN GUSTAF HOWARD.

Witnesses:

J. E. Boner), ARCHER GUSTAFSON.

